A computer program that calculates the trajectories of masses moving under mutual gravitation. Programs of this sort are used in astrophysics to study the long-term evolution of collections of stars, like globular clusters. They can also be used as an orrery.

A (woefully incomplete) list of n-body simulators available for free download (or as Java applets):

  • http://www.simtel.net/pub/pd/40358.shtml
  • http://www.smug.adelaide.edu.au/~surpdeh/Programming/3b/3body.shtml
  • http://www.reed.edu/~schuhs/382/nbody/NBody.html
  • http://www.cyf-kr.edu.pl/ftp/simtel/simtel_astronmy.html (contains a bunch of other astronomy software too).
  • http://www.cuug.ab.ca/~kmcclary/

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